Engine overheating is a common problem that drivers face from time to time, leading to expensive repairs if not fixed on time.
Hence, it is essential you know how to cool an overheated engine. Whenever you experience car overheating, your quick response plays a significant role. It can prevent the issues from escalating to other system components.
Unless you’re a petrolhead or a DIYer, you probably don’t know how to cool down a car engine quickly, so here’s an overview of what you should do when your engine is overheating.
It is crucial to act fast the moment you notice your vehicle is overheating. First thing first, switch off the air conditioning system and turn on the heater and leave it on full blast settings.
This will export the heat in the engine bay to the cabin while allowing the engine to cool down fast.
Suppose this proves abortive, or there’s too much steam coming from the engine compartment; pull off the road, open the hood, and allow the vehicle to cool. Once the engine is cool, check the coolant level and add some antifreeze if needed.
This is just an overview of what you should do, but don’t worry; this article provides a step-by-step guide to cool down an overheating engine.
How To Tell Your Engine Is Overheating?
- Rising Temperature Gauge: One of the first signs is a rising temperature gauge on your dashboard. If it moves toward the ‘H’ (Hot), it’s an indication that your engine is overheating.
- Warning Lights: Most cars have a warning light or alarm that will illuminate or sound if the engine starts to overheat.
- Steam or Smoke: If you see steam or smoke coming from under the hood of your car, it’s a clear sign that your engine is overheating.
- Loss of Power: An overheating engine may cause your vehicle to lose power or operate inefficiently.
- Unusual Smells: The smell of hot oil, burning rubber, or other unusual smells can indicate that your engine is getting too hot.
- Coolant Leak: If you notice a green, orange, or pink fluid leaking from your car, it could be coolant, indicating a problem with your cooling system.
- High Readings on the Temperature Gauge: If the temperature gauge is constantly high, even in normal driving conditions, it could mean your engine is running hot.
- Engine Knocking Sounds: Overheating can cause your engine to make knocking sounds due to the lack of lubrication on the cylinders. This is a serious sign of a potential engine breakdown.
Common Reasons for Car Overheating
Hopefully, you will never be in a situation where you have to ask why is my car overheating, but if you do begin asking yourself, “Why is my car running hot?”, it will probably be one of the following causes.
#1. Improper coolant/water mixture.
Engine coolant is sold in concentrated form and premix form from automotive retailers. If you buy the premix coolant you should check to see the temperature range that the premix is specified for and ensure that it matches the climate where you live and drive.
If you purchase concentrated coolant you will need to add water and mix it to a certain concentration to achieve the proper temperature range for your climate.
#2. Low coolant.
Low coolant level can be caused by cracks in the radiator, loose hose clamps within the system, or a worn-out hose. You can look for small or large puddles of coolant under your vehicle after it’s been parked for several hours if you are attempting to diagnose this issue.
Check out this resource on how to check your coolant level.
#3. Bad thermostat.
Your vehicle has a thermostat in the cooling system that allows water to pass through when engine temperatures rise.
If the thermostat is faulty, it won’t allow coolant to flow through and you can experience overheating. Some vehicles even have two thermostats, so check your vehicle documentation if you suspect this issue.
#4. Bad water pump.
The water pump on your car pushes water through the engine and cooling system to create the cooling cycle. Water pumps do wear out eventually, so this is a repair that is common with vehicles over 100,000 miles.
#5. Broken radiator fan.
Many older vehicles have belt-driven radiator fans, but almost all newer vehicles use small electric motors to drive the radiator fan.
The fan will cycle on and off during driving, depending on the requirements of the cooling system, but if the vehicle is parked and running, the fan should be running if the engine is hot or overheating.
#6. Broken belt.
Many modern vehicles use either the serpentine belt or another belt to drive the water pump. If the water pump belt fails, you will experience overheating quickly.
#7. Radiator obstructions.
Radiators can become clogged with debris, reducing their ability to dissipate heat. A clean and well-functioning radiator is crucial for maintaining optimal engine temperature.
#8. Low engine oil level.
If your engine does not have enough oil to lubricate its parts, then there will be a massive increase in friction and a corresponding increase in heat production.
Check your oil level and ensure that it is not black and that it’s full. Extremely black oil is a symptom of oil that needs to be changed.
How to cool an overheated engine?
#1. Turn Off the Air Conditioner.
When you notice your engine temperature climbing, the very first step is to turn off the air conditioner (AC) immediately.
Your AC system takes extra power from the engine to keep you cool. This puts added strain on an already stressed engine. By turning it off, you help remove some of the pressure and reduce the heat load.
But there’s something even smarter you can do: turn on the heater. Turning on the heater might sound uncomfortable, but it helps by moving heat away from the engine and into the car’s interior. It can actually cool your engine faster than doing nothing.
Helpful Tip: Roll down the windows to stay a little more comfortable when you blast the heater.
#2. Pull Over and Turn Off the Engine.
If turning off the AC and running the heater doesn’t quickly help — or if you notice steam or a burning smell — you must pull over safely and shut off the engine.
This step is crucial. Continuing to drive with an overheating engine can lead to expensive repairs, like a blown head gasket or a cracked engine block.
After you pull over:
- Put your car in park.
- Turn off the ignition.
- Sit back and let the engine cool naturally.
Warning: Don’t pop the hood right away. Wait at least 15-30 minutes for the engine to cool down. Opening the hood too soon can expose you to scalding steam or boiling coolant.
#3. Check Coolant Levels.
Once it’s safe to open the hood, check your coolant levels. Most cars have a clear coolant reservoir tank located near the radiator. Look at the side of the tank for “low” and “full” marks.
If the coolant level is low:
- Add coolant if you have it.
- If you don’t have coolant, plain water can be used as a temporary fix.
- Fill the reservoir slowly and carefully.
If you notice that the reservoir is completely empty, or you see a puddle of coolant under your car, you probably have a leak somewhere.
Important: Never open the radiator cap when the engine is hot. Pressure inside can cause hot liquid to spray out, causing burns.
#4. Restart and Drive Gently.
After you’ve added coolant (or water) and the engine has cooled down:
- Restart the engine.
- Keep a very close eye on the temperature gauge.
If the temperature stays normal, you can drive carefully to the nearest mechanic or auto shop.
Here’s how to drive gently:
- Avoid heavy acceleration.
- Keep speeds moderate.
- Don’t climb steep hills if you can avoid it.
- Coast as much as possible without stressing the engine.
If the temperature starts rising again, pull over immediately. It’s not worth the risk of severe engine damage.
#5. Rev the Engine in Park.
Sometimes you can’t pull over immediately, especially if you’re stuck in traffic. In that case, a quick trick is to shift into park and gently rev the engine.
Why does this work? Revving the engine a little:
- Spins the water pump faster.
- Moves coolant through the engine more quickly.
- Increases airflow through the radiator, helping it cool down.
Don’t rev it hard. Just give it small, steady revs to help the system out.
Helpful Tip: Turn on the heater at the same time to pull more heat away from the engine.
#6. Spray Water on the Radiator.
If you happen to have a bottle of water handy, you can carefully spray water onto the front of the radiator (the outside part). This can cool the radiator’s metal fins quickly, helping the entire engine system cool down.
How to do it safely:
- Wait until the engine is mostly cool.
- Lightly mist water onto the radiator.
- Avoid splashing water directly on hot engine parts like the exhaust manifold, which could crack from rapid cooling.
This trick is useful if you’re waiting for a tow truck or stuck somewhere without immediate help.
#7. Turn Off Extra Electronics.
While trying to cool down your engine, it’s smart to turn off anything that drains power:
- Radio
- Phone chargers
- Headlights (if it’s daytime)
Every little bit helps. Reducing the load on the engine’s electrical system allows more energy to go toward cooling and vital functions.
#8. Keep the Hood Popped Open (After Stopping).
After you’ve pulled over and the engine has cooled a bit, pop the hood open (don’t remove it or prop it fully if it’s still hot).
Leaving the hood popped allows trapped heat to escape more quickly into the open air, helping cool everything down faster.
Pro Tip: If you keep a small battery-powered fan in your emergency kit, you can set it up to blow air across the engine bay to cool it even faster.
What Not To Do When Your Car Engine Overheats?
#1. Don’t Panic.
Your engine isn’t keeping its cool, but you can! Avoid swerving through traffic or slamming on your brakes when pulling off the road.
#2. Don’t Keep Driving.
If your engine is overheating but still running, you’re not doing it any favors by continuing to drive. Driving while the engine is overheating can warp cylinder heads, crack the engine block, and cause irreparable damage.
Sure, you may be able to get to your destination before it gives out entirely, but pushing your engine too far may cause significant (and costly) damage.
#3. Don’t Open The Hood Immediately.
Once you’ve pulled over, wait for the engine to cool before popping the hood to check things out.
Opening the hood immediately can put you at risk of burns or injuries from spewing steam or smoke. Patience is key. Wait until the engine temperature gauge settles before opening the hood.
#4. Don’t Pour Cold Water On A Hot Engine.
The sudden temperature change could cause parts of the engine to crack.
#5. Don’t Let The Issue Linger.
An overheating engine won’t resolve itself, even if it seems to be fixed after you add a little coolant. It will only get worse if left unaddressed. To help save your engine, get to the root of the issue.
Bring your car to Firestone Complete Auto Care for a Complete Vehicle Inspection and so we can diagnose the problem and make recommendations for solving it.
How Long Does It Take For Overheating To Damage An Engine?
An overheating engine only needs 30-60 seconds (i.e. under a minute) to start causing damage to itself.
That damage can include the following:
- Pistons that explode
- Valves that seize
- Damage to the head gasket
- Engine fire
Despite the little time it takes for an engine to damage its interior components, you should take your time to cool it down. As mentioned earlier, throwing cold water on the engine is bad because the sudden temperature change will cause it to crack.
Instead, the most crucial step you can take is to shut the engine off immediately. Doing so essentially stops the source of the overheating and allows the engine to dissipate heat naturally.
And once more, raising the hood and letting the engine bay ventilate will also help the cooldown process.
FAQs.
Q: Can I still drive my car if it overheats?
Whenever you notice a temperature rise in your car, do not panic but safely pull out of the road and allow your engine to cool down. Follow the above steps to cool down your overheated engine.
While an engine overheating may not cause immediate damage to your engine, continuously driving it will cause severe engine damage.
Q: How many times can an engine overheat?
Once your temperature gauge on the instrument Cluster gets to the max high point, it takes between 30-60 seconds to start giving issues in the system.
It can cause cylinder heads to warp, swell cylinder walls and pistons, or even seize valves. A major cause is usually a substantial leak in the system.
Q: Should you wait for an engine to cool down before adding oil?
To check your engine oil, ensure your vehicle is parked on level ground so it can give an accurate reading on the oil dipstick. Allow the engine to cool down before adding or checking the oil level.
While it is recommended to check the oil level when the engine is cool, you need to ensure the engine is warm. If your vehicle is hot, allow it to cool within 5-10 minutes before checking or adding engine oil.
Final words
With the detailed step-by-step instructions in this article, you’ve learned how to cool an overheated engine. Remember, several issues can lead to overheating. After cooling an overheated engine, consult a mechanic to track and six the culprit.
Having learned that overheating can ruin an engine, if you notice and turn off your engine when the temperature dial starts creeping to the red point and allow it to cool, you won’t incur severe damage.
Cultivate a regular maintenance culture and always keep an eye on the temperature gauge while driving.